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Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis Table (Details) - Recurring Fair Value Measurements [Member] - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022
Assets |  |
Cash and cash equivalents | $ 326 | $ 356
Restricted cash and cash equivalents | 1 | 1
Total Cash, Cash Equivalents and Restricted Cash | 327 | 357
Special Use Funds [Abstract] |  |
Money market fund | 1 | 1
Commingled debt fund measured at NAV | 11 | 13
Commingled equity fund measured at NAV | 10 | 11
Total special use funds | 22 | 25
Gas Contracts | 1 | 25
Price risk management assets: |  |
Total Assets | 350 | 407
Price risk management liabilities: |  |
Interest rate swaps | 7 | 7
Gas Contracts | (23) | 66
Total price risk management liabilities | (16) | 73
Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 326 | 356
Restricted cash and cash equivalents | 1 | 1
Total Cash, Cash Equivalents and Restricted Cash | 327 | 357
Special Use Funds [Abstract] |  |
Money market fund | 1 | 1
Total special use funds | 1 | 1
Gas Contracts | 0 | 0
Price risk management assets: |  |
Total Assets | 328 | 358
Price risk management liabilities: |  |
Interest rate swaps | 0 | 0
Gas Contracts | 0 | 0
Total price risk management liabilities | 0 | 0
Level 2 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Restricted cash and cash equivalents | 0 | 0
Total Cash, Cash Equivalents and Restricted Cash | 0 | 0
Special Use Funds [Abstract] |  |
Money market fund | 0 | 0
Total special use funds | 0 | 0
Gas Contracts | 1 | 25
Price risk management assets: |  |
Total Assets | 1 | 25
Price risk management liabilities: |  |
Interest rate swaps | 7 | 7
Gas Contracts | (23) | 10
Total price risk management liabilities | (16) | 17
Level 3 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Restricted cash and cash equivalents | 0 | 0
Total Cash, Cash Equivalents and Restricted Cash | 0 | 0
Special Use Funds [Abstract] |  |
Money market fund | 0 | 0
Total special use funds | 0 | 0
Gas Contracts | 0 | 0
Price risk management assets: |  |
Total Assets | 0 | 0
Price risk management liabilities: |  |
Interest rate swaps | 0 | 0
Gas Contracts | 0 | 56
Gas Contracts, Liability, Settlements | (56) |
Total price risk management liabilities | 0 | 56
PPL Electric Utilities Corp [Member] |  |
Assets |  |
Cash and cash equivalents | 26 | 25
Price risk management assets: |  |
Total Assets | 26 | 25
PPL Electric Utilities Corp [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 26 | 25
Price risk management assets: |  |
Total Assets | 26 | 25
PPL Electric Utilities Corp [Member] | Level 2 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Price risk management assets: |  |
Total Assets | 0 | 0
PPL Electric Utilities Corp [Member] | Level 3 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Price risk management assets: |  |
Total Assets | 0 | 0
Louisville Gas And Electric Co [Member] |  |
Assets |  |
Cash and cash equivalents | 7 | 93
Price risk management assets: |  |
Total Assets | 7 | 93
Price risk management liabilities: |  |
Interest rate swaps | 7 | 7
Total price risk management liabilities | 7 | 7
Louisville Gas And Electric Co [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 7 | 93
Price risk management assets: |  |
Total Assets | 7 | 93
Price risk management liabilities: |  |
Interest rate swaps | 0 | 0
Total price risk management liabilities | 0 | 0
Louisville Gas And Electric Co [Member] | Level 2 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Price risk management assets: |  |
Total Assets | 0 | 0
Price risk management liabilities: |  |
Interest rate swaps | 7 | 7
Total price risk management liabilities | 7 | 7
Louisville Gas And Electric Co [Member] | Level 3 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Price risk management assets: |  |
Total Assets | 0 | 0
Price risk management liabilities: |  |
Interest rate swaps | 0 | 0
Total price risk management liabilities | 0 | 0
Kentucky Utilities Co [Member] |  |
Assets |  |
Cash and cash equivalents | 9 | 21
Price risk management assets: |  |
Total Assets | 9 | 21
Kentucky Utilities Co [Member] | Level 1 [Member] |  |
Assets |  |
Cash and cash equivalents | 9 | 21
Price risk management assets: |  |
Total Assets | 9 | 21
Kentucky Utilities Co [Member] | Level 2 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Price risk management assets: |  |
Total Assets | 0 | 0
Kentucky Utilities Co [Member] | Level 3 [Member] |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Price risk management assets: |  |
Total Assets | $ 0 | $ 0

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